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About Meta: Llama 3.1 405B (Base)
Meta's latest class of model (Llama 3.1) launched with a variety of sizes & flavors. This is the base 405B pre-trained version. It has demonstrated strong performance compared to leading closed-source models in human evaluations. To read more about the model release, [click here](https://ai.meta.com/blog/meta-llama-3/). Usage of this model is subject to [Meta's Acceptable Use Policy](https://llama.meta.com/llama3/use-policy/).
Technical Specifications
- Model ID
- meta-llama-llama-3.1-405b
- Category
- LLM Models
- Task
- Text Generation
- Price
- $4.000000 per million tokens
- Added
- February 20, 2026
Key Features
- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output
Quick Start
Integrate Meta: Llama 3.1 405B (Base) into your application with a single API call. Get your API key from the pricing page to get started.
import requestsimport jsonurl = "https://modelslab.com/api/v7/llm/chat/completions"headers = {"Content-Type": "application/json"}data = {"model_id": "meta-llama-llama-3.1-405b","messages": [{"role": "user","content": "Hello!"}],"max_tokens": 1000,"key": "YOUR_API_KEY"}try:response = requests.post(url, headers=headers, json=data)response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX)result = response.json()print("API Response:")print(json.dumps(result, indent=2))except requests.exceptions.HTTPError as http_err:print(f"HTTP error occurred: {http_err} - {response.text}")except Exception as err:print(f"Other error occurred: {err}")
View the full API documentation for SDKs, code examples in Python, JavaScript, and more.
Pricing
Meta: Llama 3.1 405B (Base) API costs $4.000000 per million tokens. Pay only for what you use with no minimum commitments. View pricing plans
Use Cases
- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction
Meta: Llama 3.1 405B (Base) FAQ
Meta's latest class of model (Llama 3.1) launched with a variety of sizes & flavors. This is the base 405B pre-trained version. It has demonstrated strong performance compared to leading closed-source models in human evaluations. To read more about the model release, [click here](https://ai.meta.c
You can integrate Meta: Llama 3.1 405B (Base) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "meta-llama-llama-3.1-405b" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.
Meta: Llama 3.1 405B (Base) costs $4.000000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started.
The model ID for Meta: Llama 3.1 405B (Base) is "meta-llama-llama-3.1-405b". Use this ID in your API requests to specify this model.
Yes, ModelsLab offers a free tier that lets you try Meta: Llama 3.1 405B (Base) and other AI models. Sign up to get free API credits and start building immediately.